# geometry

Home/Tag: geometry
25 09, 2017

## Pythagorean Theorem proof

A right triangle. This is the proof of the Pythagorean Theorem supposedly written by Pythagoras about 500 BC: The Pythagorean Theorem says that in a right triangle, the sum of the squares of the two right-angle [...]

6 08, 2017

## René Descartes – European philosophy

By |2019-05-06T07:44:32-07:00August 6th, 2017|Modern Europe, Philosophy|0 Comments

René Descartes Who was Descartes? René Descartes was one of the earliest philosophers of the European Enlightenment, in the early 1600s AD. He was just 8 years younger than Hobbes. While Descartes [...]

4 08, 2017

## Medieval science in Europe

By |2018-04-24T09:01:17-07:00August 4th, 2017|Medieval, Science|1 Comment

Medieval science: an Italian pharmacy jar, about 1400 AD (Metropolitan Museum, New York) Learning from Islamic science During the Middle Ages, the best scientists and doctors weren't in Europe. They were [...]

29 07, 2017

## Numbers and math

A number line is infinite in both directions. Numbers are a convenient way for people to organize their thoughts about space and time. First we can think of zero as a point, taking up no [...]

29 07, 2017

## What is area? Simple geometry

Calculating the area of your room. The area of a room is the size of the floor. Suppose you wanted to find out whether your room was really bigger than [...]

29 07, 2017

## What is a triangle? Simple geometry

This is an equilateral triangle. A triangle is any set of three points on a plane and the lines connecting those points to each other, as long as the three points aren't all on the [...]

29 07, 2017

## What is a trapezoid? Simple geometry

This is a trapezoid. A trapezoid is a kind of quadrilateral that has at least two sides that are parallel to each other. A parallelogram is a trapezoid that has two pairs of parallel [...]

29 07, 2017